Wanted to share that Rackspace has an excellent collection of configuration guides for Ubuntu 10.04 server. Aside from Ubuntu they’ve got guides for every other big Linux distribution as well, such as Fedora, Red Hat, Debian and CentOS. I don’t use those distributions myself but thought it would be nice to mention it. Check their List of Articles for a complete list of Linux distributions. Aside from Linux they’ve also covered Windows Server 2003 and 2008.